Hot-press string welding machine and hot-press string welding method

Abstract

The present invention provides a hot-press string welding machine and a hot-press string welding method, wherein the hot-press string welding machine includes a solder ribbon supply device, a battery cell supply device, a pressing device, a hot pressing device, and a welding conveyor device, wherein: the solder ribbon supply device and the battery cell supply device stack preheated solder ribbon groups and battery cells on the welding conveyor device according to a predetermined rule; the welding conveyor device is used to heat the solder ribbon groups and battery cells and convey the stacked solder ribbon groups and battery cells; the pressing device is used to press the stacked solder ribbon groups and battery cells so that the hot-melt layer of the solder ribbon groups heated and melted by the welding conveyor device is bonded to the battery cells; the hot pressing device is located above the welding conveyor device and is used to hot-press the bonded solder ribbon groups and battery cells; the hot pressing device is used to hot-press the bonded solder ribbon groups and battery cells so that the solder ribbon groups are pressed onto the battery cells. The present invention presses the solder ribbons onto the battery cells via the hot-melt layer on the surface of the solder ribbons, thereby producing a high-quality battery string.

Description

Technical Field

[0001] The present invention relates to the field of battery production, in particular to a hot pressing string welding machine and a hot pressing string welding method. Background Art

[0002] The soldering ribbon is a crucial component in photovoltaic modules, improving efficiency and reducing costs. It connects multiple solar cells in series, thus collecting current. Currently, most technologies use infrared welding to weld the ribbon to the solar cells. This method consumes a lot of energy, and a large number of solder joints increases the production cost of the ribbon and the photovoltaic module. It also increases the light-shielding area of ​​the ribbon, causing optical loss and reducing the power generation efficiency of the photovoltaic module. A small number of solder joints makes it difficult to determine the correct placement of the solder pads, and the ribbon welds can become loose, causing cracks in the solar cells. This can rapidly reduce the power generation efficiency of the photovoltaic module and even lead to complete failure.

[0003] In view of this, the industry has proposed a new type of soldering ribbon with a hot-melt layer on the surface. After the soldering ribbon and the battery cell are stacked, they are hot-pressed. That is, the soldering ribbon can be directly pressed onto the battery cell through the molten hot-melt layer to obtain a high-quality battery string, effectively avoiding the light decay phenomenon caused by battery components produced by infrared welding.

[0004] Traditional cell welding devices cannot use this type of welding ribbon to connect cells in series. Therefore, it is necessary to develop a hot press stringing machine specifically for this type of welding process. Summary of the Invention

[0005] In order to achieve the above technical objectives, the first aspect of the present invention provides a hot press string welding machine, which adopts the following technical solutions:

[0006] A hot press stringer uses a welding ribbon assembly to weld a plurality of battery cells into a battery string. The welding ribbon assembly includes a plurality of welding ribbons of predetermined lengths coated with a hot melt layer. The hot press stringer includes a welding ribbon supply device, a battery cell supply device, a pressing device, a hot pressing device, and a welding conveying device, wherein:

[0007] The solder ribbon providing device is used to provide the preheated solder ribbon group to the welding conveyor device, and the battery cell providing device is used to provide the battery cells to the welding conveyor device. The solder ribbon providing device and the battery cell providing device stack the preheated solder ribbon group and the battery cells on the welding conveyor device according to a predetermined rule;

[0008] The welding conveyor device is used to heat the welding ribbon group and the battery cells and convey the stacked welding ribbon group and the battery cells. The pressing device is used to press the stacked welding ribbon group and the battery cells so that the hot-melt layer of the welding ribbon group heated and melted by the welding conveyor device is bonded to the battery cells.

[0009] The hot pressing device is located above the welding conveyor device and is used to implement the overall compression of the bonded welding ribbon group and battery cells;

[0010] The hot pressing device is used to perform hot pressing on the soldering ribbon group and the battery cell that are bonded together, so that the soldering ribbon group is pressed onto the battery cell as a whole.

[0011] Through the cooperation of the soldering ribbon providing device, the battery cell providing device, the pressing device, the hot pressing device and the welding conveying device, the hot pressing string welding machine of the present invention presses the soldering ribbon onto the battery cell through the hot melt layer on the surface of the soldering ribbon, thereby forming a high-quality battery string.

[0012] In some embodiments, the welding ribbon providing device includes multiple welding ribbon rolls, a welding ribbon heating mechanism, a welding ribbon cutting mechanism and a welding ribbon pulling mechanism, wherein: the welding ribbon pulling mechanism is used to clamp the welding ribbons on the multiple welding ribbon rolls and pull the welding ribbons, so that the welding ribbons pass through the welding ribbon heating mechanism and the welding ribbon cutting mechanism in turn to the preset position; the welding ribbon heating mechanism is used to heat the welding ribbon and the hot melt layer coated on the welding ribbon, so that the welding ribbon and the hot melt layer coated on the welding ribbon have an initial temperature; the welding ribbon cutting mechanism is used to cut the welding ribbon to form a group including multiple welding ribbons with a predetermined length; the welding ribbon pulling mechanism is also used to stack the clamped welding ribbon group onto the welding conveying device.

[0013] Through the cooperation of the welding ribbon heating mechanism, the welding ribbon cutting mechanism and the welding ribbon pulling mechanism, the welding ribbon providing device can automatically obtain a welding ribbon group including multiple welding ribbons with predetermined lengths from multiple welding ribbon rolls, and after completing the heating of the welding ribbon group, stack the welding ribbon group onto the welding conveying device.

[0014] In some embodiments, the welding conveying device includes a conveyor belt and a heating plate; the conveyor belt is used to convey the stacked welding ribbon groups and battery cells; the heating plate is arranged under the conveyor belt, and is used to heat the welding ribbon group to melt the hot melt layer coated on the welding ribbon.

[0015] The setting of the heating plate realizes heating of the hot melt layer on the surface of the welding ribbon group, making it easier for the pressing device to press the welding ribbon and the battery cell together.

[0016] In some embodiments, the heating plate includes a first heating plate disposed below the conveyor belt of the hot pressing device and second heating plates disposed on both sides of the first heating plate, and the temperature of the first heating plate is higher than that of the second heating plate.

[0017] The second heating plate is provided to preheat the ribbon group and the battery cell, so that the ribbon group and the battery cell are pre-connected. The first heating plate is provided to further heat the ribbon group and the battery cell, and the hot pressing device is used to complete the overall connection between the ribbon group and the battery cell.

[0018] In some embodiments, the hot pressing device includes a pressing plate and a moving device for driving the pressing plate toward or away from the solder ribbon assembly and the solar cell.

[0019] The provision of the compression plate enables a more complete compression connection between the solder ribbon assembly and the battery cell.

[0020] In some embodiments, the solder strip heating mechanism is a hot air heating mechanism, an infrared heating mechanism, an electric heating wire heating mechanism, a laser heating mechanism, or an electromagnetic heating mechanism.

[0021] The present invention provides a simple structure and high heating efficiency of the welding ribbon heating mechanism, which can achieve rapid and efficient preheating of the welding ribbon and the hot melt layer covering the welding ribbon. By heating the hot melt layer on the surface of the welding ribbon, the welding ribbon is effectively prevented from stretching and deformation caused by the hot melt layer shrinking during the laying of the welding ribbon.

[0022] By preheating the soldering ribbon and the hot melt layer covering the soldering ribbon, deformation of the soldering ribbon caused by shrinkage of the hot melt layer after the soldering ribbon is straightened is avoided.

[0023] In some embodiments, the battery cell providing device includes a battery cell loading mechanism, a battery cell conveying mechanism, a positioning platform and a stacking mechanism, wherein: the battery cell loading mechanism is used to load the battery cells in the battery box onto the battery cell conveying mechanism, the battery cell conveying mechanism is used to convey the battery cells to the positioning platform, the positioning platform is used to position the battery cells, the stacking mechanism is used to pick up the battery cells from the positioning platform and stack the battery cells onto the welding conveying device; a regularizing mechanism is provided on the positioning platform, and the regularizing mechanism is used to regularize the battery cells on the positioning platform.

[0024] Through the cooperation of the battery cell loading mechanism, battery cell conveying mechanism, positioning platform and stacking mechanism, the battery cell providing device realizes the automatic material collection, conveying, positioning and stacking of battery cells.

[0025] In some embodiments, the clamping device includes a tool conveying mechanism, a tool stacking mechanism, a clamping tool, and a tool removal mechanism, wherein: the tool conveying mechanism is arranged at the side of the welding conveying device, and the tool conveying mechanism is used to circulate the clamping tool; the tool stacking mechanism is used to move the clamping tool on the tool conveying mechanism to the welding conveying device to compress the stacked solder ribbon group and battery cells; the tool removal mechanism is used to move the clamping tool from the welding conveying device back to the tool conveying mechanism. Alternatively, the clamping device includes a tool conveying mechanism, a clamping tool, and a tool removal mechanism, wherein: the tool conveying mechanism is arranged at the side of the welding conveying device, the discharge end of the tool conveying mechanism is close to the positioning platform, and the tool conveying mechanism is used to circulate the clamping tool; the stacking mechanism is also used to move the clamping tool on the discharge end of the tool conveying mechanism to the welding conveying device to compress the stacked solder ribbon group and battery cells; the tool removal mechanism is used to move the clamping tool from the welding conveying device back to the tool conveying mechanism.

[0026] By configuring the clamping device, the clamping tool can be reused. In the second embodiment, the stacking mechanism is reused, meaning it can be used to stack the cells and also to transport the clamping tool from the discharge end of the tool conveyor mechanism to the welding conveyor, thus saving equipment costs.

[0027] In some embodiments, the pressing tool includes: a support plate, at least one support bar installed on the support plate, and a plurality of pressing pins installed on the support bar, each pressing pin corresponding to a welding strip in the welding strip group.

[0028] A pressing tool with a simple structure and easy use is provided, which can ensure that all welding ribbons in a welding ribbon group are pressed onto corresponding main grid lines, thereby reducing the risk of cold welding.

[0029] In some embodiments, the pressing device is fixedly connected to the conveying movable portion of the welding conveyor device. After the pressing device presses the stacked solder ribbon group and battery cells, it moves synchronously with the pressed solder ribbon group and battery cells.

[0030] By fixing the clamping device on the conveying movable part of the welding conveying device and moving it synchronously with the clamped welding ribbon group and battery cell, there is no need to set up additional tooling handling mechanism and tooling circulation mechanism, so the welding ribbon group and battery cell can be clamped, which reduces the equipment cost.

[0031] In some embodiments, the hot pressing device is located after the pressing device. After the pressing device completes the pressing of the solder ribbon group and the battery cell and leaves the solder ribbon group and the battery cell, the hot pressing device then performs hot pressing on the solder ribbon group and the battery cell that are bonded together.

[0032] By setting up the hot pressing device and the pressing device, the connection strength between the welding ribbon group and the battery cell is guaranteed, and interference between the pressing device and the hot pressing device is prevented.

[0033] In some embodiments, the ribbon cutting mechanism includes a clamping portion and a cutting portion, wherein the clamping portion is used to clamp the ribbon and the cutting portion is used to cut the ribbon clamped by the clamping portion. The hot press stringer also includes a string cutting device disposed at the unloading end of the welding conveyor device, which is used to cut the battery string.

[0034] The clamping and cutting parts work together to cut the soldering ribbon and clamp the free end of the cut ribbon to prevent it from curling back or falling. The string cutting device allows the battery string to be cut into sections, resulting in battery strings of a predetermined length.

[0035] The present invention also provides a hot-press welding method, which uses a welding ribbon group to weld several battery cells into a battery string, wherein the welding ribbon group includes multiple welding ribbons with predetermined lengths and coated with a hot-melt layer. The hot-press welding method includes: providing a heated welding ribbon group and providing battery cells; stacking the preheated welding ribbon group and battery cells on a welding conveyor according to predetermined rules; the welding conveyor heats the welding ribbon group to melt the hot-melt layer coated on the surface of the welding ribbon; pressing the stacked welding ribbon group and battery cells so that the hot-melt layer of the welding ribbon group is bonded to the battery cells; hot-pressing the welding ribbon group and battery cells bonded together so that the welding ribbon group is pressed onto the battery cells.

[0036] The hot-pressing string welding method of the present invention directly presses the welding ribbon onto the battery cell through the hot-melt layer on the surface of the welding ribbon, thereby forming a high-quality battery string.

[0037] In some embodiments, providing a heated soldering ribbon group includes: clamping the soldering ribbons on a plurality of soldering ribbon rolls and pulling the soldering ribbons so that the soldering ribbons pass through a heating station and a soldering ribbon cutting station in sequence and then reach a preset position; heating the soldering ribbons and a hot melt layer covering the soldering ribbons; and cutting the soldering ribbons to form a soldering ribbon group including a plurality of soldering ribbons with a predetermined length.

[0038] Automatic acquisition and automatic heating of the welding ribbon group are realized.

[0039] In some implementations, hot-pressing the solder ribbon assembly and the battery cell together includes: completing compression of the battery cell and the solder ribbon assembly before hot-pressing, and hot-pressing the compressed solder ribbon assembly and battery cell.

[0040] In some embodiments, the preheated solder ribbon group and battery cells are stacked on a welding conveyor device according to predetermined rules, including: the i-th battery cell is stacked on the second half of the i-th solder ribbon group, and the first half of the i+1-th solder ribbon group is stacked on the i-th battery cell, where i is any natural number greater than 0.

[0041] The invention provides a stacking method for solar cells with positive and negative main grid lines respectively arranged on the front and back sides, so as to ensure that the solar cells connected in series can be turned on.

[0042] In some embodiments, N+1 preheated solder ribbon groups are provided, N battery cells are provided, and the preheated solder ribbon groups and battery cells are stacked on a welding conveyor according to predetermined rules, including: the second half of the first solder ribbon group is stacked on the first battery cell, and the first half of the first solder ribbon group is placed on the welding conveyor; the second half of the i-th solder ribbon group is stacked on the i-th battery cell, and the first half of the i-th solder ribbon group is stacked on the i-1-th battery cell, where i is any natural number greater than 1 and less than N+1; the second half of the N+1-th solder ribbon group is placed on the welding conveyor, and the first half of the N+1-th solder ribbon group is stacked on the N-th battery cell.

[0043] The invention provides a stacking method for solar cells with both positive and negative main grid lines arranged on the back, so as to ensure that the solar cells connected in series can be turned on. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic structural diagram of a hot-press string welding machine provided in an embodiment of the present invention;

[0045] Figure 2 A schematic diagram of stacking battery cells and solder ribbon groups in one embodiment of the present invention;

[0046] Figure 3 A schematic diagram of stacking battery cells and solder ribbon assemblies in another embodiment of the present invention;

[0047] Figures 1 to 3 Included are:

[0048] The welding ribbon providing device 10 includes a welding ribbon roll 11, a welding ribbon heating mechanism 12, a welding ribbon cutting mechanism 13, and a welding ribbon pulling mechanism 14;

[0049] Cell supply device 20: cell loading mechanism 21, cell conveying mechanism 22, positioning platform 23, stacking mechanism 24;

[0050] Pressing device 30: tooling conveying mechanism 31, pressing tooling 32, tooling removal mechanism 33;

[0051] Welding conveyor device 40;

[0052] Hot pressing device 50;

[0053] String cutting device 60;

[0054] Battery box 100. DETAILED DESCRIPTION

[0055] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] Conventional cell welding setups are unable to connect cells in series using a hot-melt-coated ribbon assembly. Therefore, it is necessary to develop a hot-press stringing machine and method specifically designed for this type of welding process, which can connect cells in series using a hot-melt-coated ribbon assembly.

[0057] The following will introduce the hot-pressing string welding machine and the hot-pressing string welding method provided by the present invention by way of two embodiments.

[0058] First embodiment

[0059] like Figure 1 As shown, the hot pressing string welding machine provided in this embodiment includes a welding ribbon providing device 10, a battery cell providing device 20, a pressing device 30, a hot pressing device 50 and a welding conveying device 40, wherein:

[0060] The solder ribbon providing device 10 is used to provide the preheated solder ribbon group to the welding conveyor device 40, and the battery cell providing device 20 is used to provide the battery cells to the welding conveyor device 40. The solder ribbon providing device 10 and the battery cell providing device 20 stack the preheated solder ribbon group and battery cells on the welding conveyor device 40 according to predetermined rules.

[0061] The welding conveyor 40 is used to heat the solder ribbon assembly and the cell and convey the stacked solder ribbon assembly and cell. The pressing device 30 is used to press the stacked solder ribbon assembly and cell so that the heated and melted hot-melt layer of the solder ribbon assembly adheres to the cell. That is, the pressing device 30 presses the heated solder ribbon assembly so that the melted hot-melt layer on its surface adheres and positions it on the cell.

[0062] The hot pressing device 50 is located above the welding conveying device 40 and is used to perform hot pressing on the bonded solder ribbon assembly and battery cells, so that the solder ribbon assembly is completely pressed onto the battery cells, thereby obtaining the final battery string.

[0063] It can be seen that through the cooperation of the welding ribbon providing device 10, the battery cell providing device 20, the pressing device 30, the hot pressing device 50 and the welding conveying device 40, the hot pressing string welding machine in the embodiment of the present invention presses the welding ribbon to the battery cell through the hot melt layer on the surface of the welding ribbon group, thereby obtaining a high-quality battery string.

[0064] Optionally, the hot pressing device 50 is located after the pressing device 30. After the pressing device 30 completes the pressing of the solder ribbon group and the battery cell and leaves the solder ribbon group and the battery cell, the hot pressing device 50 performs an overall hot pressing operation on the solder ribbon group and the battery cell that are bonded together.

[0065] Continuing with reference to Figure 1 , the welding ribbon providing device 10 optionally includes a plurality of welding ribbon rolls 11, a welding ribbon heating mechanism 12, a welding ribbon cutting mechanism 13, and a welding ribbon pulling mechanism 14. The welding ribbon pulling mechanism 14 is configured to clamp the welding ribbons on the plurality of welding ribbon rolls 11 and pull the welding ribbons, so that the welding ribbons pass through the welding ribbon heating mechanism 13 and the welding ribbon cutting mechanism 14 in sequence to a predetermined position. The welding ribbon heating mechanism 12 is configured to heat the welding ribbons and the hot melt layer covering the welding ribbons. The welding ribbon cutting mechanism 13 is configured to cut the welding ribbons to form a plurality of welding ribbons of a predetermined length. The welding ribbon pulling mechanism 14 is further configured to stack the clamped welding ribbons onto the welding conveyor device 40.

[0066] Optionally, the welding ribbon pulling mechanism 14 includes a plurality of clamping jaws, each clamping jaw clamping a welding ribbon and pulling the welding ribbon.

[0067] The welding conveying device 40 includes a conveyor belt and a heating plate; the conveyor belt is used to convey the stacked welding ribbon groups and battery cells; the heating plate is arranged under the conveyor belt, and is used to heat the welding ribbon group to melt the hot melt layer coated on the welding ribbon.

[0068] Optionally, the temperature of the heating plate below the solder ribbon group can be set in a step-up state from the position of receiving the battery cells and the solder ribbon group to the position of the hot pressing device, and the temperature of the heating plate can be set in a step-down state from the position of the hot pressing device to the tail end of the welding conveying device 40.

[0069] Optionally, the heating plate includes a first heating plate arranged below the conveyor belt of the hot pressing device and second heating plates arranged on both sides of the first heating plate, and the temperature of the first heating plate is higher than the temperature of the second heating plate.

[0070] The hot pressing device includes a pressing plate and a moving device for driving the pressing plate to move closer to or away from the welding ribbon group and the battery sheet.

[0071] The setting of the pressing plate can realize the overall downward pressure of the soldering strip, so that the soldering strip is completely pressed and adhered to the battery cell.

[0072] Optionally, a heating rod can be provided on the pressing plate to heat the pressing plate, thereby further heating the ribbon assembly and the battery cell, ensuring a better pressing effect. The hot pressing device presses the ribbon assembly and the battery cell together. The hot pressing device can only provide pressing force, or the hot pressing device can also provide pressing force and heat the ribbon assembly and the battery cell through the pressing plate.

[0073] The welding ribbon heating mechanism 12 can adopt various known heating mechanisms, such as a hot air heating mechanism, an infrared heating mechanism, an electric heating wire heating mechanism, a laser heating mechanism, an electromagnetic heating mechanism, etc.

[0074] By preheating the soldering ribbon and the hot melt layer covering the soldering ribbon, deformation of the soldering ribbon caused by shrinkage of the hot melt layer after the soldering ribbon is straightened is avoided.

[0075] Optionally, the ribbon cutting mechanism 13 includes a clamping portion and a cutting portion, wherein the clamping portion is used to clamp the ribbon, and the cutting portion is used to cut the ribbon clamped by the clamping portion. The cooperation between the clamping portion and the cutting portion not only achieves the cutting of the ribbon, but also clamps the free end of the cut ribbon to prevent the ribbon from rolling back or falling.

[0076] Optionally, the hot-press stringing machine of the embodiment of the present invention further includes a string cutting device 60 provided at the unloading end of the welding conveying device 40 , and the string cutting device 60 is used to cut the battery string to obtain a battery string with a predetermined length.

[0077] Continue to refer Figure 1 As shown, optionally, the cell providing device 20 includes a cell loading mechanism 21, a cell conveying mechanism 22, a positioning platform 23 and a stacking mechanism 24, wherein:

[0078] The battery cell loading mechanism 21 is used to load the battery cells in the battery box 100 onto the battery cell conveying mechanism 22 , and the battery cell conveying mechanism 22 is used to convey the battery cells to the positioning platform 23 .

[0079] The positioning platform 23 is used to implement positioning of the battery cell. Optionally, a camera is provided above the positioning platform 23. By taking pictures of the battery cell with the camera, the position information of the battery cell on the positioning platform can be obtained, thereby implementing positioning of the battery cell.

[0080] The stacking mechanism 24 picks up the battery cells from the positioning platform 23 based on the battery cell position information and stacks the picked battery cells onto the welding conveyor 40. The stacking mechanism 24 can adopt various known transfer devices with grasping and suction functions, such as a manipulator with a gripper, electromagnetic adsorption, or suction cup.

[0081] Optionally, the positioning platform 23 is further provided with a regularization mechanism, which is used to regularize the battery cells on the positioning platform to adjust the positions of the battery cells.

[0082] Continue to refer Figure 1 As shown, Figure 1 In the embodiment, the clamping device 30 includes a tool conveying mechanism 31 , a clamping tool 32 and a tool moving mechanism 33 , wherein the tool conveying mechanism 31 is arranged on the side of the welding conveying device 40 , and the discharge end of the tool conveying mechanism 31 is close to the positioning platform 23 .

[0083] The tool conveying mechanism 31 is used for cyclically conveying the compacting tool 32 .

[0084] The stacking mechanism 24 of the cell providing device 20 is further used to transport the pressing tool 32 on the discharge end of the tool conveying mechanism 31 to the welding conveying device 40 to press the stacked welding ribbon group and cell cells.

[0085] The tooling moving mechanism 33 is used to move the pressing tooling 32 from the welding conveying device 40 back to the tooling conveying mechanism 31 after the pressing is completed, thereby realizing the recycling of the pressing tooling 32.

[0086] Of course, in some other embodiments, the pressing tool 32 may not be transported by the stacking mechanism 24 of the battery cell providing device 20, but a special tool stacking mechanism may be provided to transport the pressing tool 32 on the discharge end of the tool conveying mechanism 31 to the welding conveying device 40.

[0087] Optionally, the pressing tool 32 includes: a support plate, at least one support bar installed on the support plate and a plurality of pressing pins installed on the support bar, each pressing pin corresponds to a welding strip in the welding strip group, thereby ensuring that each welding strip in the welding strip group is pressed onto a main grid line of the battery cell.

[0088] The pressing of the pressing pins can realize the preliminary local connection between the soldering ribbon group and the battery cell, and the hot pressing device can realize the overall pressing connection between the soldering ribbon group and the battery cell.

[0089] Alternatively, a clamping device can be fixedly connected to the movable conveyor portion of the welding conveyor 40. After the clamping device compresses the stacked ribbon assembly and battery cells, it moves synchronously with the compressed ribbon assembly and battery cells. This eliminates the need for additional tooling transport and circulation mechanisms, while still achieving compression of the ribbon assembly and battery cells, reducing equipment costs.

[0090] Second embodiment

[0091] The hot-press string welding method provided in this embodiment can be implemented by the hot-press string welding machine in the first embodiment. Specifically, the battery string welding method includes:

[0092] Provide a heated solder ribbon assembly and a battery cell.

[0093] The preheated solder ribbon assembly and battery cells are stacked onto the soldering conveyor according to predetermined rules.

[0094] The welding conveyor device is used to heat the welding ribbon group and battery cells and convey the stacked welding ribbon group and battery cells.

[0095] The stacked solder ribbon assembly and battery cells are pressed tightly so that the hot-melt layer of the solder ribbon assembly heated and melted by the soldering conveyor device is bonded to the battery cells.

[0096] Under the heating state of the welding conveyor, the welding ribbon group and the battery cell are bonded together by heat pressing, so that the welding ribbon group is pressed on the battery cell.

[0097] Optionally, providing a heated solder ribbon assembly specifically includes:

[0098] Clamp the welding ribbons on multiple welding ribbon rolls and pull the welding ribbons so that the welding ribbons pass through the heating station and the welding ribbon cutting station in sequence and then reach the preset position;

[0099] The welding strip and the hot melt layer covering the welding strip are heated by the welding strip heating mechanism at the heating station.

[0100] The welding ribbon is cut by a welding ribbon cutting mechanism at the welding ribbon cutting station to form a welding ribbon group including a plurality of welding ribbons with a predetermined length.

[0101] Optionally, hot pressing the solder ribbon group and battery cells together includes: completing the pressing of the battery cells and the solder ribbon group before hot pressing, canceling the pressing of the battery cells and the solder ribbon group by the pressing station, and then hot pressing the pressed solder ribbon group and battery cells.

[0102] As is known to those skilled in the art, conventional solar cells have main grid lines on both the front and back sides. Figure 2 As shown, the preheated solder ribbon group and solar cells are stacked on the soldering conveyor according to a predetermined rule, specifically:

[0103] The i-th battery cell is stacked on the second half of the i-th welding ribbon group, and the first half of the i+1-th welding ribbon group is stacked on the i-th battery cell, where i is any natural number greater than 0.

[0104] By stacking the solder ribbon group and the solar cells according to this rule, it can be ensured that the solar cells connected in series are conductive.

[0105] In addition to the traditional solar cells with busbars on both the front and back, a back-contact solar cell with busbars only on the back has emerged in the industry in recent years, that is, both the positive and negative busbars are set on the back of the solar cell. Figure 3 As shown, it is assumed that N+1 preheated solder ribbon groups and N solar cells are stacked. Figure 3 In the example, N is 4. For back-contact solar cells, the preheated solder ribbon assembly and solar cells are stacked on the welding conveyor according to a predetermined rule, specifically:

[0106] The second half of the first solder ribbon group is stacked on the first solar cell, and the first half of the first solder ribbon group is placed on the soldering conveyor.

[0107] The second half of the i-th solder ribbon group is stacked on the i-th solar cell, and the first half of the i-th solder ribbon group is stacked on the i-1-th solar cell, where i is any natural number greater than 1 and less than N+1.

[0108] The second half of the N+1th welding ribbon group is placed on the welding conveyor device, and the first half of the N+1th welding ribbon group is stacked on the Nth battery cell.

[0109] By stacking the soldering ribbons and the cells in this way, it is possible to ensure that the back-contact cells connected in series are conductive. Of course, during the stacking process, the cells are placed on the welding conveyor with their backs facing upwards.

[0110] After the final welding is completed, the first welding ribbon group is the head welding ribbon group of the battery string, and the N+1th welding ribbon group is the tail welding ribbon group of the battery string.

[0111] It should be noted that the various optional implementations in the first embodiment described above are also applicable to this embodiment and will not be described in detail here.

[0112] The present invention has been described above in sufficient detail with certain particularities. Those skilled in the art will appreciate that the descriptions in the embodiments are merely illustrative, and that all modifications that do not depart from the true spirit and scope of the invention are intended to be within the scope of protection of the present invention. The scope of protection claimed in the present invention is defined by the appended claims, not by the foregoing description of the embodiments.

Claims

1. A hot press stringing machine, which uses a welding ribbon assembly to weld a plurality of battery cells into a battery string, wherein the welding ribbon assembly comprises a plurality of welding ribbons of predetermined lengths coated with a hot melt layer, characterized in that: The hot pressing string welding machine includes a welding ribbon providing device, a battery cell providing device, a pressing device, a hot pressing device and a welding conveying device, wherein: The solder ribbon providing device is used to provide the preheated solder ribbon group to the welding conveyor device, and the battery cell providing device is used to provide the battery cells to the welding conveyor device. The solder ribbon providing device and the battery cell providing device stack the preheated solder ribbon group and battery cells on the welding conveyor device according to a predetermined rule; The welding conveyor device is used to heat the welding ribbon group and the battery cells and convey the stacked welding ribbon group and the battery cells. The pressing device is used to press the stacked welding ribbon group and the battery cells so that the hot-melt layer of the welding ribbon group heated and melted by the welding conveyor device is adhered to the battery cells. The hot pressing device is used to press the solder ribbon assembly and the battery cell together so that the solder ribbon assembly is pressed onto the battery cell. The welding conveying device includes a conveying belt and a heating plate; The conveyor belt is used to convey the stacked welding ribbon groups and battery cells; The heating plate is arranged below the conveyor belt and is used to heat the welding belt group to melt the hot melt layer coated on the welding belt; The heating plate includes a first heating plate arranged below the conveyor belt and second heating plates arranged on both sides of the first heating plate. The temperature of the first heating plate is higher than that of the second heating plate.

2. The hot press string welding machine according to claim 1, characterized in that: The welding ribbon providing device includes a plurality of welding ribbon rolls, a welding ribbon heating mechanism, a welding ribbon cutting mechanism and a welding ribbon pulling mechanism, wherein: The welding ribbon pulling mechanism is used to clamp the welding ribbons on the plurality of welding ribbon rolls and pull the welding ribbons so that the welding ribbons pass through the welding ribbon heating mechanism and the welding ribbon cutting mechanism in sequence to a preset position; The welding ribbon heating mechanism is used to heat the welding ribbon hot melt layer so that the welding ribbon and the hot melt layer coated on the welding ribbon have an initial temperature; The welding ribbon cutting mechanism is used to cut the welding ribbon to form a welding ribbon group including a plurality of welding ribbons with a predetermined length; The welding ribbon traction mechanism is also used to stack the clamped welding ribbon group onto the welding conveying device.

3. The hot press string welding machine according to claim 1, characterized in that: The hot pressing device includes a pressing plate and a moving device for driving the pressing plate to move closer to or away from the welding ribbon group and the battery cell.

4. The hot press string welding machine according to claim 2, characterized in that: The welding strip heating mechanism is a hot air heating mechanism, an infrared heating mechanism, an electric heating wire heating mechanism, a laser heating mechanism or an electromagnetic heating mechanism.

5. The hot press string welding machine according to claim 1, characterized in that: The battery cell providing device includes a battery cell loading mechanism, a battery cell conveying mechanism, a positioning platform and a stacking mechanism, wherein: The battery cell loading mechanism is used to load the battery cells in the battery box onto the battery cell conveying mechanism, the battery cell conveying mechanism is used to convey the battery cells to the positioning platform, the positioning platform is used to position the battery cells, and the stacking mechanism is used to pick up the battery cells from the positioning platform and stack the battery cells onto the welding conveying device; The positioning platform is provided with a regularization mechanism, and the regularization mechanism is used to regularize the battery cells on the positioning platform.

6. The hot-press stringer according to claim 5, characterized in that: The clamping device includes a tool conveying mechanism, a tool stacking mechanism, a tool clamping and tool removal mechanism, wherein: The tool conveying mechanism is arranged on the side of the welding conveying device, and the tool conveying mechanism is used to circulate and convey the pressing tool; The tool stacking mechanism is used to transport the pressing tool on the tool conveying mechanism to the welding conveying device to press the stacked welding ribbon group and battery cells; The tool removal mechanism is used to transport the pressing tool from the welding conveying device back to the tool conveying mechanism; or The clamping device includes a tool conveying mechanism, a clamping tool, and a tool moving mechanism, wherein: The tool conveying mechanism is arranged on the side of the welding conveying device, the discharge end of the tool conveying mechanism is close to the positioning platform, and the tool conveying mechanism is used to circulate and convey the pressing tool; The stacking mechanism is further used to transport the pressing tool on the discharge end of the tool conveying mechanism to the welding conveying device to press the stacked welding ribbon group and battery cells; The tooling moving mechanism is used to move the pressing tooling from the welding conveying device back to the tooling conveying mechanism.

7. The hot press string welding machine according to claim 6, characterized in that: The pressing tool comprises: a support plate, at least one support bar installed on the support plate, and a plurality of pressing pins installed on the support bar, each of the pressing pins correspondingly pressing one welding strip in the welding strip group.

8. The hot press string welding machine according to claim 1, characterized in that: The pressing device is fixedly connected to the conveying movable part of the welding conveying device. After the stacked welding ribbon group and battery cells are pressed, the pressing device moves synchronously with the pressed welding ribbon group and battery cells.

9. The hot press string welding machine according to claim 1, characterized in that: The hot pressing device is located after the pressing device. After the pressing device completes the pressing of the solder ribbon group and the battery cell and leaves the solder ribbon group and the battery cell, the hot pressing device then performs hot pressing on the solder ribbon group and the battery cell that are bonded together.

10. The hot-press stringer according to claim 2, wherein: The welding strip cutting mechanism includes a clamping portion and a cutting portion, wherein the clamping portion is used to clamp the welding strip, and the cutting portion is used to cut the welding strip clamped by the clamping portion; The hot-press string welding machine further includes a string cutting device provided at a discharge end of the welding conveying device, and the string cutting device is used to cut the battery string.

11. A hot press string welding method, wherein a plurality of battery cells are welded into a battery string using a welding ribbon assembly, wherein the welding ribbon assembly comprises a plurality of welding ribbons of predetermined lengths coated with a hot melt layer, characterized in that: The hot-press string welding machine according to any one of claims 1 to 10 is used for implementation, and the hot-press string welding method comprises: Provide preheated solder ribbon assembly and battery cells; The preheated solder ribbon assembly and solar cells are stacked on the soldering conveyor according to predetermined rules; The welding conveyor device heats the welding ribbon group to melt the hot melt layer covering the surface of the welding ribbon; Press the stacked solder ribbon assembly and battery cells tightly so that the solder ribbon assembly is bonded to the battery cells through the melted hot-melt layer; The soldering ribbon assembly and the battery cell are bonded together by heat pressing, so that the soldering ribbon assembly is pressed onto the battery cell as a whole.

12. The hot pressing string welding method according to claim 11, wherein: The method of providing a preheated soldering ribbon assembly includes: Clamp the welding ribbons on multiple welding ribbon rolls and pull the welding ribbons so that the welding ribbons pass through the heating station and the welding ribbon cutting station in sequence and then reach the preset position; Heating the welding ribbon and the hot melt layer covering the welding ribbon; The soldering ribbon is cut to form a group including a plurality of soldering ribbons having a predetermined length.

13. The hot pressing string welding method according to claim 11, wherein: The ribbon assembly and cell that are thermocompression bonded together include: The battery cells and the solder ribbon assembly are compacted before hot pressing, and the compacted solder ribbon assembly and battery cells are hot pressed.

14. The hot pressing string welding method according to claim 11, wherein: The method of stacking the preheated solder ribbon assembly and the solar cells on the soldering conveyor device according to a predetermined rule includes: The i-th cell is stacked on the rear half of the i-th solder ribbon group, and the front half of the i+1-th solder ribbon group is stacked on the i-th cell, where i is any natural number greater than 0.

15. The hot-pressing string welding method according to claim 11, wherein: Providing N+1 preheated solder ribbon groups and N solar cells, wherein stacking the preheated solder ribbon groups and solar cells on a soldering conveyor according to a predetermined rule comprises: The second half of the first welding ribbon group is stacked on the first solar cell, and the first half of the first welding ribbon group is placed on the welding conveyor device; The second half of the i-th solder ribbon group is stacked on the i-th solar cell, and the first half of the i-th solder ribbon group is stacked on the i-1-th solar cell, where i is any natural number greater than 1 and less than N+1; The second half of the N+1th welding ribbon group is placed on the welding conveyor device, and the first half of the N+1th welding ribbon group is stacked on the Nth battery cell.

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